Explanation:
a,answer= AC=39 is the hypotenuse
b answer=
by using Pythagoras theorem
h square = p square +b square
here, let's take angle A as a reference angle
L square = AC square - AB A square
l^2= 39^2- 36^2
l ^2 = 1521-1296
l= root under 225
l=15 answer